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在不影响冷却塔冷却性能的前提下,对双曲冷却塔塔筒下部半径和下支柱斜率进行微调,并分析了其对结构动力特性、承载性能及稳定性的影响。研究表明,塔筒下部子午线形对结构的线性特征值屈曲分析结果影响甚微,下支柱斜率等于或略小于塔筒下缘斜率可以有效提高结构基频,提高其抗风性能。塔筒下部区域斜率的突然下降或持续快速下降均会使附近环向膜应力及环向位移发生突变,也因此可能使局部稳定无法满足要求。所以,在设计中应保证塔筒下部区域的子午向斜率与上部斜率一致缓慢下降,使应力分布连续平缓,同时又可在不增加壁厚的情况下满足局部稳定要求。
On the premise of not affecting the cooling performance of the cooling tower, the lower radius of the tower and the slope of the lower pylon are finely tuned, and the influences on the dynamic characteristics, bearing capacity and stability of the tower are analyzed. The results show that the meridian shape at the lower part of the tower has little effect on the buckling analysis of the linear eigenvalues of the structure. The slope of the lower pylon is equal to or slightly less than the slope of the lower edge of the tower, which can effectively increase the fundamental frequency of the structure and improve its wind resistance. A sudden drop in the slope of the lower section of the tower, or its continued rapid decline, can cause sudden changes in the surrounding circumferential membrane stresses and toroidal displacements, thereby possibly rendering the local stability unsatisfactory. Therefore, in design, it is necessary to ensure that the meridional slope of the lower part of the tower descends in unison with the upper slope, so that the stress distribution is continuous and gentle, and at the same time, the local stability requirement can be satisfied without increasing the wall thickness.